Continuity mistake: When English, Bough and his wife are looking at Garroch Castle from the submarine, Bough's wife says to English, "Jeremy has always spoken very highly of you." However, in the first Johnny English film, it was established that Bough's first name is Angus.
Continuity mistake: When the headmaster enters the classroom and asks the pupils where Johnny English is, English is not standing in camouflage against the wall, but he is doing so when the headmaster leaves.
Continuity mistake: When English gets in the driver's ed car, there's a cell phone on the console when he looks at the pedals on his side. When he steps on the gas, you see part of the console and now there's some sort of magazine that wasn't there before.
Continuity mistake: When Ophelia grabs Johnny English at the mansion, she pulls out a gun and places it to English's temple, but when the camera is behind him in the next shot, the gun is now much further up.
Answer: Because, it was time for a comeback, so they tasked Bough to complete the team.